Relatedness through experience: On the importance of collected worker experiences for plant performance

We demonstrate that multiple cognitive dimensions exist between employees in knowledge intensive business services (KIBS) and that these dimensions interact in their influence on plant performance. Knowledge and cognitive distance are measured as formal knowledge and industry experience. Pooled OLS regressions with year, industry, and region‐fixed effects are used to estimate the impact on plant performance. The results suggest that the commonly found negative impact of similarity in formal knowledge on plant performance may be reduced by high human capital ratios or high levels of similarity in experience. Moreover, the organizational structures associated with single‐plant and multi‐plant firms, generate different plant performance outcomes of knowledge variety.     

Impacts of green roofs and rain water use on the water balance and groundwater levels in urban areas

Ohne Zusammenfassung

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Impacts of green roofs and rain water use on the water balance and groundwater levels in urban areas

     

Occurrence of aromatic amines and N-nitrosamines in the different steps of a drinking water treatment plant

The occurrence of 24 amines within a full scale drinking water treatment plant that used chlorinated agents as disinfectants was evaluated for the first time in this research. Prior to any treatment (raw water), aniline, 3-chloroaniline, 3,4-dichloroaniline and N-nitrosodimethylamine were detected at low levels (up to 18 ng/L) but their concentration increased ∼10 times after chloramination while 9 new amines were produced (4 aromatic amines and 5 N-nitrosamines). Within subsequent treatments, there were no significant changes in the amine levels, although the concentrations of 2-nitroaniline, N-nitrosodimethylamine and N-nitrosodiethylamine increased slightly within the distribution system. Eleven of the 24 amines studied were undetected either in the raw and in the treatment plant samples analysed. There is an important difference in the behaviour of the aromatic amines and N-nitrosamines with respect to water temperature and rainfall events. Amine concentrations were higher in winter due to low water temperatures, this effect being more noticeable for N-nitrosamines. Aromatic amines were detected at their highest concentrations (especially 3,4-dichloroaniline and 2-nitroaniline) in treated water after rainfall events. These results may be explained by the increase in the levels of amine precursors (pesticides and their degradation products) in raw water since the rainfall facilitated the transport of these compounds from soil which was previously contaminated as a result of intensive agricultural practices.     

锅炉房汽水系统CAD开发思路的探讨与实现

探讨了面向方案的概念在开发锅炉房汽水系统ＣＡＤ软件中的具体应用,其中包括开放的设备数据库、三维设计环 境、设计知识的组织和管理等,从而形成了一套完整的ＣＡＤ软件的开发与实现模式。     

城镇污水处理厂水污染物竣工环保验收监测执行标准应用和验收监测工况把握

为确保"十二五"期间的减排指标体系、监测体系和考核体系等各项目标的全面落实,需更好规范城镇污水处理厂竣工环保验收工作。本文对城镇污水处理厂在竣工环保验收期间水污染物验收监测执行标准的选用方法进行了整理,对如何正确把握验收监测工况进行了探讨。     

PEX管的性能特点及其在低温热水地板辐射采暖上的应用

本文论述了PEX管材的性能特点以及PEX管材与其它管材相比所独具的优势，并着重阐述了PEX管材在低温热水地板辐射采暖系统上的应用。